Creating .NET Maui installer fails to build

[SteveFrench1520]

Question

I am trying to create an msi installer for a .NET maui application. When I build the associated wix project to create the installer, the build fails due to invalid localization.

Repro steps

1. Create new Maui application
   dotnet new maui
2. Remove non-windows build targets for the maui app. This can be done by removing the following line from Maui.csproj:
   <TargetFrameworks>net9.0-android;net9.0-ios;net9.0-maccatalyst</TargetFrameworks>
3. Delete all platform files for non windows platforms

4. Create a wix project in a parallel directory (adapted from https://docs.firegiant.com/wix/tutorial/)

<!--wix.wixproj-->

<Project Sdk="WixToolset.Sdk/6.0.0">
    <ItemGroup>
        <ProjectReference Include="..\Maui\Maui.csproj" />
    </ItemGroup>
</Project>

<!--package.wxs-->

<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
    <Package
            Name="MauiApp"
            Manufacturer="Steve"
            Version="1.0.0"
            UpgradeCode="11f25fac-26d0-4955-b519-92a0e0c8d41e">
        <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeError)" />
        <Feature Id="Main">
            <ComponentGroupRef Id="Maui" />
        </Feature>
    </Package>
</Wix>

<!--maui.wxs-->

<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
    <Fragment>
        <ComponentGroup Id="Maui" Directory="INSTALLFOLDER">
            <Files Include="..\WixMaui\Maui\bin\Debug\net9.0-windows10.0.19041.0\win10-x64\**" />
        </ComponentGroup>
    </Fragment>
</Wix>

<!--Folders.wxs-->

<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
    <Fragment>
        <StandardDirectory Id="ProgramFiles6432Folder">
            <Directory
                    Id="INSTALLFOLDER"
                    Name="!(bind.Property.Manufacturer) !(bind.Property.ProductName)">
            </Directory>
        </StandardDirectory>
        <MediaTemplate EmbedCab="yes" />
    </Fragment>
</Wix>

<!--maui.en-us.wxl-->

<WixLocalization xmlns="http://wixtoolset.org/schemas/v4/wxl" Culture="en-us">
    <String Id="DowngradeError" Value="A more recent version of [ProductName] is already installed." />
</WixLocalization>

4. run dotnet build in wix project directory

Repro link

https://github.com/SteveFrench1520/WixMaui

Result

PS WixMaui\Wix> dotnet build
Restore complete (0.6s)
Maui net9.0-windows10.0.19041.0 succeeded (12.4s) → WixMaui\Maui\bin\Debug\net9.0-windows10.0.19041.0\win10-x64\Maui.dll
wix failed with 6 error(s) and 4 warning(s) (34.9s)

WixMaui\Wix\maui.wxs(4): warning WIX1076: ICE03: String overflow (greater than length permitted in column); Table: File, Column: Language, Key(s): fls6jw.4v2im7LnSTXMmKEQWvS8yiE

WixMaui\Wix\maui.wxs(4): error WIX0204: ICE03: Invalid Language Id; Table: File, Column: Language, Key(s): flsBPx2xN.iMfwdGP9lKEFxVSSJnlw

WixMaui\Wix\maui.wxs(4): error WIX0204: ICE03: Invalid Language Id; Table: File, Column: Language, Key(s): flsEupM8mUNI1loDNnTWGNXAmmzvGk

WixMaui\Wix\maui.wxs(4): error WIX0204: ICE03: Invalid Language Id; Table: File, Column: Language, Key(s): flsMnVxH7qDEmK36RyoItyMr5h5t0I

WixMaui\Wix\maui.wxs(4): error WIX0204: ICE03: Invalid Language Id; Table: File, Column: Language, Key(s): flsUr54p4xiNbZRsx6ibrUSpDFJTE4

WixMaui\Wix\maui.wxs(4): error WIX0204: ICE03: Invalid Language Id; Table: File, Column: Language, Key(s): fls_DHE8WPOyBCgzxSjSvWN0odH5sA

WixMaui\Wix\maui.wxs(4): error WIX0204: ICE03: Invalid Language Id; Table: File, Column: Language, Key(s): flsjefJ3pli2pEgLqrRxRpEWCfK_98

WixMaui\Wix\maui.wxs(4): warning WIX1076: ICE60: The file flsZSyyvke8_xtiisTru8qUiLJjtyc is not a Font, and its version is not a companion file reference. It should have a language specified in the Language column.

WixMaui\Wix\maui.wxs(4): warning WIX1076: ICE60: The file flsqk.2jZOhJr5zBICJhZ9hG58LwXw is not a Font, and its version is not a companion file reference. It should have a language specified in the Language column.

Expected Result

A .msi file is created that installs the .NET maui template on the windows platform

Open Source Maintenance Fee

• I (or an organization I'm a member of) pay the Open Source Maintenance Fee by sponsoring the wixtoolset project because I support the maintainers.

[barnson]

Open the intermediate .msi in Orca and look at the values in the File table.

[robmen]

Yeah, looks like a bunch of your executable files are missing language resources and the Windows Installer doesn't like that. Those errors are from ICEs which are the static analysis from Microsoft.